This is the main theme (not the opening theme) of Higurashi No Naku Koro Ni. Hey! Just realised that there is a link for this on Tv Tropes (yay!!!!) But seriously, the other songs are way creepier than this Tropers just so you know.
DISCLAIMER!!!! I do not own the anime, music or artwork. This is for people's enjoyment only...so enjoy ^_^